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Echolocation Quotes

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Echolocation Quotes

“It does appear that some parts of our evolutionary process seem inevitable. It is striking that throughout evolutionary history, the eye evolved independently fifty to a hundred times. This is strong evidence for the fact that the different rolls of the dice that have occurred across different species seem to have produced species with eyes regardless of what is going on around them. Lots of other examples illustrate how some features, if they are advantageous, seem to rise to the top of the evolutionary swamp. This is illustrated every time you see the same feature appearing more than once in different parts of the animal kingdom. Dolphins and bats, for example, use echolocation, but they evolved this trait independently at very different points on the evolutionary tree.”

EyeProcessChanceHistoryEvolutionEvidenceSpeciesBatsFactDolphinsTopAnimal KingdomFeatureSwampTraitEvolutionaryRollsIndependentlyEvolvedEcholocationAdvantageousEvolutionary Tree
Book:The Great Unknown: Seven Journeys to the Frontiers of Science
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“In order to avoid the deafening of conspecifics, some bats employ a jamming avoidance response, rapidly shifting frequencies or flying silent when foraging near conspecifics. Because jamming is a problem facing any active emission sensory system, it is perhaps not surprising (though no less amazing) that similar jamming avoidance responses are deployed by weakly electric fish. The speed of sound is so fast in water that it makes it difficult for echolocating whales to exploit similar Doppler effects. However, the fact that acoustic emissions propagate much farther and faster in the water medium means that there is less attenuation of ultrasound in water, and thus that echolocation can be used for broader-scale 'visual' sweeping of the undersea environment. These constraints and trade-offs must be resolved by all acoustic ISMs, on Earth and beyond. There are equally universal anatomical and metabolic constraints on the evolvability of echolocation that explain why it is 'harder' to evolve than vision. First, as noted earlier, a powerful sound-production capacity, such as the lungs of tetrapods, is required to produce high-frequency emissions capable of supporting high-resolution acoustic imaging. Second, the costs of echolocation are high, which may limit acoustic imaging to organisms with high-metabolisms, such as mammals and birds. The metabolic rates of bats during echolocation, for instance, are up to five times greater than they are at rest. These costs have been offset in bats through the evolutionarily ingenious coupling of sound emission to wing-beat cycle, which functions as a single unit of biomechanical and metabolic efficiency. Sound emission is coupled with the upstroke phase of the wing-beat cycle, coinciding with contraction of abdominal muscles and pressure on the diaphragm. This significantly reduces the price of high-intensity pulse emission, making it nearly costless. It is also why, as any careful crepuscular observer may have noticed, bats spend hardly any time gliding (which is otherwise a more efficient means of flight).”

BatsMetabolismEcholocationWing Beat Cycle
Book:Contingency and Convergence: Toward a Cosmic Biology of Body and Mind
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“As with cross-modal task transfer in echolocating dolphins, spontaneous cross-modal recognition in weakly electric fish strongly suggests that electrolocated objects are being perceived holistically in three dimensions with a representational format and/or phenomenological quality that is analogous in fundamental ways to vision. Object recognition across ISMs is thus a robustly replicable phenomenon and is indicative of both the common representational formats of ISM percepts and their global access. Further, as von der Emde and colleagues point out, cross-modal recognition is not a quirk of experimental artifice. Rather, it is a crucial adaptive functionality that ensures reliable perception in complex environments in which information flowing in from different senses must be weighted and adjusted in accordance with fluctuating conditions, such as changes in turbidity, lighting conditions, and so forth.”

VisionEcholocationElectrolocationCross Modality
Book:Contingency and Convergence: Toward a Cosmic Biology of Body and Mind
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